improvements in keyboards and add tgWebAppStartParamField

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt

@@ -96,6 +96,8 @@ val telegramInlineModeGifPermittedMimeTypes by lazy {
     )
 }
 
+const val tgWebAppStartParamField = "tgWebAppStartParam"
+
 const val chatIdField = "chat_id"
 const val senderChatIdField = "sender_chat_id"
 const val messageIdField = "message_id"

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/extensions/WebAppParamHelper.kt

@@ -0,0 +1,5 @@
+package dev.inmo.tgbotapi.utils.extensions
+
+import dev.inmo.tgbotapi.types.tgWebAppStartParamField
+
+fun createWebAppStartParam(value: String) = tgWebAppStartParamField to value